BASF Ultradur B 4300 G6 (PBT, 30% glass fibre), injection moulding grade; product information sheet 09/2026, typical values for uncoloured product at 23 °C.
SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Is Plastic PBT GF30 stronger than Solder SAC305?
Plastic PBT GF30 is stronger: its tensile strength is 140 MPa against yield strength 22 MPa for Solder SAC305 (6.36x).
Which is lighter, Plastic PBT GF30 or Solder SAC305?
Plastic PBT GF30 is lighter: 1,530 kg/m³ against 7,350 kg/m³ for Solder SAC305.
Which is stiffer, Plastic PBT GF30 or Solder SAC305?
Plastic PBT GF30 is stiffer: Young's modulus 9.8 GPa against 6.9 GPa for Solder SAC305, so the same part in Plastic PBT GF30 deflects less under the same load.
Which is lighter for the same job, Plastic PBT GF30 or Solder SAC305?
For the same stiffness or strength: Plastic PBT GF30 is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate, strong rod or tie, strong beam, strong panel or plate.
Part that must be
Plastic PBT GF30
Solder SAC305
Stiff rod or tie (tension)
lighter
6.82x heavier
Stiff beam (bending)
lighter
5.73x heavier
Stiff panel or plate
lighter
5.4x heavier
Strong rod or tie
lighter
30.6x heavier
Strong beam
lighter
16.5x heavier
Strong panel or plate
lighter
12.1x heavier
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Which conducts heat better, Plastic PBT GF30 or Solder SAC305?
Solder SAC305 conducts heat better: 61 W/m·K against 0.27 W/m·K for Plastic PBT GF30.
Which expands less with temperature?
Solder SAC305 expands less: 21.9 µm/m·K against 25 µm/m·K for Plastic PBT GF30.